Could also connect a bunch of locks and put all the keys on a key ring. Lots of pictures of latch, lock, etc ideas for montessori type preschool. This lock one could be made with 2 boards, some o-rings, and some locks from Dollar Store.
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Origin Architect transforms Beijing factory into a theatre complex "A huge folding wall lifts up to reveal the contents of a rusted steel auditorium at this old printing factory in Beijing, converted into a theatre complex.